The Puritans, what we generally mean when we say 'founding protestants,' weren't fleeing persecution from Catholics.
In fact, they weren't fleeing persecution at all! They were living in the (relatively) religiously tolerant Netherlands. They left the Netherlands because they weren't succeeding in business there. They came to North America essentially as economic migrants.
I think the Pilgrims lived in the Netherlands for about 10 years, in a refugee town run by Catholics. But they were a minority on the Mayflower. I don’t think any spoke Dutch.
In fact, they weren't fleeing persecution at all! They were living in the (relatively) religiously tolerant Netherlands. They left the Netherlands because they weren't succeeding in business there. They came to North America essentially as economic migrants.